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High-frequency surface acoustic wave propagation in nanostructures characterized by coherent extreme ultraviolet beams
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10.1063/1.3090032
/content/aip/journal/apl/94/9/10.1063/1.3090032
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/9/10.1063/1.3090032
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Figures

Image of FIG. 1.
FIG. 1.

Setup for ultrafast SAW dispersion measurements. Nickel lines of thickness or 20 nm, width between 65 nm and , and period are patterned on a sapphire substrate. An 800 nm laser pulse heats the Ni creating a periodic stress that excites a SAW. This SAW is then probed by observing the dynamically changing diffraction of an ultrafast 29 nm EUV pulse from the surface.

Image of FIG. 2.
FIG. 2.

Dynamic EUV diffraction from SAWs on samples of sapphire with periodically spaced lines of nickel. Nickel line periods of and with width of (top) and and 160 nm with (bottom) were heated and probed. Impulsive heating and rapid thermal expansion launch SAWs whose oscillations are superimposed upon a nonoscillatory signal component that decays due to thermal diffusion. The SAW frequencies are shown in the insets.

Image of FIG. 3.
FIG. 3.

Measured SAW frequency (top) and velocity (bottom) for propagation in two sets of samples with nanopatterned Ni on sapphire. Significant deviation from the Rayleigh velocity in sapphire is observed for the smaller grating periods. The measured velocity dispersion agrees with an effective mass-loading calculation.

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/content/aip/journal/apl/94/9/10.1063/1.3090032
2009-03-03
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-frequency surface acoustic wave propagation in nanostructures characterized by coherent extreme ultraviolet beams
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/9/10.1063/1.3090032
10.1063/1.3090032
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